'Take a picture using the camera' startup error

[markowanga]

Page URL: https://flutter.dev/docs/cookbook/plugins/picture-using-camera.html
Page source: https://github.com/flutter/website/tree/master/src/docs/cookbook/plugins/picture-using-camera.md

Description of issue:
E/flutter (17924): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.
E/flutter (17924): If you're running an application and need to access the binary messenger before runApp() has been called (for example, during plugin initialization), then you need to explicitly call the WidgetsFlutterBinding.ensureInitialized() first.
E/flutter (17924): If you're running a test, you can call the TestWidgetsFlutterBinding.ensureInitialized() as the first line in your test's main() method to initialize the binding.
E/flutter (17924): #0 defaultBinaryMessenger. (package:flutter/src/services/binary_messenger.dart:76:7)
E/flutter (17924): #1 defaultBinaryMessenger (package:flutter/src/services/binary_messenger.dart:89:4)
E/flutter (17924): #2 MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:140:62)
E/flutter (17924): #3 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:35)
E/flutter (17924): #4 MethodChannel.invokeListMethod (package:flutter/src/services/platform_channel.dart:335:40)
E/flutter (17924): #5 availableCameras (package:camera/camera.dart:81:10)
E/flutter (17924): #6 getFrontCamera (package:aow_eye/main.dart:10:25)
E/flutter (17924): #7 main (package:aow_eye/main.dart:19:29)
E/flutter (17924): #8 _runMainZoned.. (dart:ui/hooks.dart:239:25)
E/flutter (17924): #9 _rootRun (dart:async/zone.dart:1126:13)
E/flutter (17924): #10 _CustomZone.run (dart:async/zone.dart:1023:19)
E/flutter (17924): #11 _runZoned (dart:async/zone.dart:1518:10)
E/flutter (17924): #12 runZoned (dart:async/zone.dart:1502:12)
E/flutter (17924): #13 _runMainZoned. (dart:ui/hooks.dart:231:5)
E/flutter (17924): #14 _startIsolate. (dart:isolate-patch/isolate_patch.dart:307:19)
E/flutter (17924): #15 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)
E/flutter (17924):

On: Nexus 5X

[sfshaza2]

@johnpryan, can you take a look?